Manamune and Manamusa

I havn't really tried these items until I saw a pro player using it as Jayce on MOBAFire. The two most favorite tops I play are Wu Kong and Jayce so today I tried it on Jayce.  In my opinion I think the item is amazing. The tear of the goddess basically allows you to spam your spells to harass the enemy, and after the upgrade your damage increases pretty well.  I think after the mana nerf on Jayce this item is ridiculously good for Jayce. I hope i can figure out my build on Jayce so that I can start going into ranked.